Depression treatment course is about six months or more, some need 2-5 years, can be divided into three phases: the first, acute phase treatment. The second, consolidation phase treatment. The third, maintenance phase treatment. Acute treatment takes about 4-6 weeks, this stage is mainly to choose the right drug for the patient and observe the effect of the drug. After the acute phase, the patient enters the consolidation phase, which is the continuation of the medication and dosage used in the acute phase, and the patient’s symptoms basically reach a stable state in the consolidation phase, which lasts about 4-9 months. After the consolidation phase, the patient enters the final phase of treatment, the maintenance phase of treatment, the maintenance phase of treatment is mainly to gradually reduce the dose of drugs to the patient can maintain a relatively stable state of the dose, this time varies from person to person, the shortest may be a few weeks, the longest may be a few months or even a few years, that is, there is no way to reduce the drug or can not stop the drug.